Update Readme.md

Missing `collect`
if args is falsy, assume a default collection.

This is kind of an edge case.
When the command's option is not required, and the option is not optional, and we follow the

```
 *      program
 *        .command(..)
 *        .description(..)
 *        .action(function(){
 *        });
```

pattern, then after some event chaining args happens to be `undefined` which breaks the flow.

Providing a default value if args do not exist, will make the function less error-prone nonetheless; and it won't cause any regression in the existing behavior.
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Merge pull request #214 from Mithgol/patch-1

use SVG to display Travis CI build testing status
Merge pull request #203 from plievone/patch-1

Update Readme.md
Merge pull request #209 from v0lkan/feature/minor-action-fix

if args is falsy, assume a default collection.
removed unused fs module
drop Node.js v0.4.x testing
add testing in Node.js v0.8.x, v0.10.x
Node.js versions are actually strings (e.g. "0.10" !== 0.1)
Merge pull request #218 from Mithgol/patch-1

drop Node.js v0.4.x testing
fix typo reported in #99
Merge pull request #217 from tonylukasavage/patch-1

removed unused fs module
Merge upstream master